Mastercard have teamed up with Transport for London to offer two free days of travel. The catch? You need to use your contact-less Mastercard on the spots you would normally use your Oyster card. So all in all, pretty easy.
From what we understand, your card will be charged on the day but you will be refunded within 28 days. The maximum refund will be £21.80 per day.
This offer will be available on Friday 14th and Friday 28th November.